D-H. Kim และ A. S. Balasubramaniam and I. Gratchev. (2018) Application of Photogrammetry and Image Analysis for Rock Slope Investigation. <i>The Geotechnical Engineering Journal of the SEAGS & AGSSEA</i>, <i>49</i>(2), pp 49-56.D-H. Kim และ A. S. Balasubramaniam and I. Gratchev. "Application of Photogrammetry and Image Analysis for Rock Slope Investigation". The Geotechnical Engineering Journal of the SEAGS & AGSSEA 49 (2018):pp 49-56.D-H. Kim และ A. S. Balasubramaniam and I. Gratchev. Application of Photogrammetry and Image Analysis for Rock Slope Investigation. Southeast Asian Geotechnical Society:ม.ป.ท. 2018.